Just a quick question which I am hoping somebody can help me with.

Currently I have 4 forms called frm1 -> frm4

Each form opens the next form using the following code until all four forms are open on the screen with the latest one, frm4, being the modal form.

What I would like is for frm2toopen from frm1 and frm3 to open from frm2 buth when frm 4 is generated from frm3 I would like forms 2 & 3 to close leaving just 1 & 4. Can anybody help? If I try to close or hide any of the forms then any previous forms in the chain disappear completely.

Thank you to anybody taking the time to read this.

-Gary

Just keep track of your form instances explicitly:

Form2 mForm2;

private void button1_Click(object sender, EventArgs e) {
if (mForm2 == null) {
mForm2 = new Form2();
mForm2.FormClosed += new FormClosedEventHandler(mForm2_FormClosed);
}
mForm2.Show();
}

void mForm2_FormClosed(object sender, FormClosedEventArgs e) {
mForm2 = null;
}

Now you can automatically close a form as needed:

private void button2_Click(object sender, EventArgs e) {
if (mForm2 != null) mForm2.Close();
new Form3().Show();
}

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Hans Passant.

Use a static class to keep track of the form instances. This functionality is already provided by the Application.OpenForms property. It's buggy but it might work for you.

---

Hans Passant.

Just keep track of your form instances explicitly:

Form2 mForm2;

private void button1_Click(object sender, EventArgs e) {
if (mForm2 == null) {
mForm2 = new Form2();
mForm2.FormClosed += new FormClosedEventHandler(mForm2_FormClosed);
}
mForm2.Show();
}

void mForm2_FormClosed(object sender, FormClosedEventArgs e) {
mForm2 = null;
}

Now you can automatically close a form as needed:

private void button2_Click(object sender, EventArgs e) {
if (mForm2 != null) mForm2.Close();
new Form3().Show();
}

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Hans Passant.

Thanks for the response,

I am new to c# so am a little confused, if form 2 spawns 3 and 3 spawns 4, I can use your solution to close both 2 & 3 when 4 is created?

To me it looks like all the code is contained within one form at present not across 3.

Again sorry for the questions but I am new.

Regards

Gary

Use a static class to keep track of the form instances. This functionality is already provided by the Application.OpenForms property. It's buggy but it might work for you.

---

Hans Passant.